Rotor for dynamo-electric machines.



A. KINGSBURY. ROTOR FOR DYNAMO ELECTRIC MACHINES.

APPLICATION FILED )ULY13.1910.

- Patented Nov. 30, 1915.

2 SHEETSSHEET 1.

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A. KINGSBURY.

ROTOR FOR DYNAMO ELECTRIC MACHINES.

APPLICATION FILED JULYI3. 1910.

1 1 62,493. Patented Nov. 30, 1915.

2 SHEETS-SHEET 2.

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ALBERT KINGSBURY, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSEELECTRIC AND MANUFACTURING COMPANY, A

CORPORATION 0F PENNSYLVANIA.

ROTOR FOR DYNAlYIO-ELECTRIC MACHINES.

Specification of Letters Patent.

Patented Nov. 30, 1915.

Application filed July 13, 1910. Serial No. 571,802.

To all whom it may concern Be it known that I, ALBERT KINGSBURY, acitizen of the United States, and a resident of Pittsburgh, in thecounty of Allegheny and State of Pennsylvania, have invented a new anduseful Improvement in Rotors for Dynamo-Electric Machines, of which thefollowing is a specification.

My invention relates to the rotating parts of dynamo-electric machinesand particularly to such parts of relatively large machines which areusually provided with a steel spider, to which magnetizable core membersare secured.

The object of my invention is to provide a simple and durable substitutefor the usual spider which shall be very much stronger than thoseheretofore used for the same weight and cost of material employed, or,in other words, a structure by the use of which the cost and weight of alarge size or high speed rotor may be materially re duced.

My invention is illustrated in the accompanying drawings in which Figure1 is a sectional elevation of a dynamo-electric machine constructed inaccordance therewith, and Fig. 2 is a partially sectional plan view ofthe machine shown in Fig. 1.

Referring to the drawings, the dynamoelectric machine here shown is ofthe vertical type, although my invention may be applied to machineshaving a horizontal shaft, and comprises a vertical shaft 1, guidebearings 2 and 3 therefor, a stationary frame 4, a magnetizable coremember 5 secured thereto and held in position by means of end plates 6,an armature winding 7 for the stationary member and a rotor 8.

The rotor comprises a plurality of thin steel disks 9 which are mountedside-by-side on the shaft 1, the bottom disk resting against a shoulder10 thereon. The opposite faces of each disk are provided with shallowannular grooves 11 and 12 and the widths of which are approximatelyequal to half the distance between the shaft and the outer circumferenceof the disks. The shallowest portions of the grooves are nearest to theshaft and the deepest portions are farthest from the shaft, so that theweb has a tapering section, as shown in Fig. 1.

The disks are clamped together by bolts 13 and 11 which extend throughall the disks and are respectively located close to the shaft and nearthe circumference of the disks. The grooves 11 and 12 materially reducethe weight of the rotor, and at the same time equalize the stressesthroughout the disks.

The outer edges of the assembled disks are provided with dove-tailedgrooves 15 which receive dove-tailed projections 16 of pole pieces 17,that are disposed in the usual manner about the circumference of therotor.

The pole pieces may be secured to the outer surface of the disks in anysuitable manner and it is evident that my invention is adapted for usewith dynamo-electric machines of various types and may, in fact, beutilized in the construction of fly Wheels and other devices for whichspiders have heretofore been employed.

I claim as my invention:

1. A rotor for a dynamo-electric machine comprising a shaft, a pluralityof thin metal disks assembled side-by-side thereon and having shallowannular grooves in their opposite faces, the widths of which areapproximately equal to one half the distance between the shaft and thedisk peripheries, and radially disposed magnetizable pole pieces securedto the outer edges of said disks.

2. A rotor for a dynamo-electric machine comprising a shaft, a pluralityof thin steel disks assembled side-by-side thereon and provided withshallow annular grooves between their inner and their outer edges, andmagnetizable pole pieces secured to, and projecting radially outwardfrom, the outer surface of the assembled disks.

3. A rotor for a dynamo-electric machine comprising a plurality of thindisks having shallow annular grooves of progressively increasing depthfrom their inner to their outer circumference to equalize the stressesthroughout each disk.

4. A rotor comprising a shaft, a plurality of thin metal disks assembledthereon sidesubscribed my name this 7th day of July, by-side and havingshallow annular grooves 1910.

of progressivel inoreasin de th outWardl r T to reduce the s ectional arfla airid the weight ALBERT KINGSBUR} 5 and to equalize the stressesthroughout each Witnesses:

disk. BERTRAND P. ROWE,

In testimony whereof, I have hereunto 13.13. HINEs.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

